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In a four hole system such as SRAM the BCD (bolt circle diameter) is simply the distance between the hole centres of two opposite holes and is best measured from the outer edge of one hole to the inner edge of the opposite hole.

Five hole systems such as Shimano are more complicated.

1. Measure the distance between adjacent holes. Call this distance C.

2. Then the BCD is given by: BCD = C/sin(180/N) where N is the number of holes.

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Answers

As long as the BCD and hole count on the chainring matches that on your crank spider, you should be ok to use different brands with different cranks. Some cranks have specific BCD/ Spider alignment; if you drop us an email with details of your crank (model, year etc) we will be able to have a closer look for you. http://www.chainreactioncycles.com/...

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